<template>
  <div class='home-category'>
    <ul class="menu">
      <li v-for="item in menuList" :key="item.id">
        <RouterLink :to="`/category/${item.id}`" @mousemove="categoryId = item.id">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <router-link v-for="sub in item.children" :key="sub.id" :to="`/category/sub/${sub.id}`">
            {{ sub.name }}
          </router-link>
        </template>
        <!-- 骨架 -->
        <template v-else>
          <XtxSkeleton width="60px" height="18px" style="margin-right:5px" bg="rgba(255,255,255,0.2)" />
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4>{{ currCategory && currCategory.id === 'brand' ? '品牌' : '分类' }}推荐 <small>根据您的购买或浏览记录推荐</small></h4>
      <!-- 分类布局 -->
      <ul v-if="currCategory && currCategory.goods">
        <li :class="{ active: categoryId === goods.id }" v-for="goods in currCategory.goods" :key="goods.id">
          <RouterLink to="/">
            <img v-lazy="goods.picture" :alt="goods.name">
            <div class="info">
              <p class="name ellipsis-2">{{ goods.name }}</p>
              <p class="desc ellipsis">{{ goods.desc }}</p>
              <p class="price"><i>¥</i>{{ goods.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 品牌布局 -->
      <ul v-if="currCategory && currCategory.brands">
        <li class="brand" v-for="brand in currCategory.brands" :key="brand.id">
          <RouterLink to="/">
            <img v-lazy="brand.picture" :alt="brand.name">
            <div class="info">
              <p class="place"><i class="iconfont icon-dingwei"></i>{{ brand.place }}</p>
              <p class="name ellipsis">{{ brand.name }}</p>
              <p class="desc ellipsis-2">{{ brand.desc }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
// 引入vuex
import { useStore } from 'vuex'
// 引入组合式API
import { computed, reactive, ref } from 'vue'
// 引入api
import { findBrand } from '@/api/home'
export default {
  name: 'HomeCategory',
  setup () {
    // 定义品牌数据
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      children: [{ id: 'brand-child', name: '品牌推荐' }],
      brands: []
    })
    const store = useStore()
    // 最终使用的数据 = 9个分类 + 1个品牌
    const menuList = computed(() => {
      // 得到9个分类且每个分类下的子分类只有两个
      const list = store.state.category.list.map(item => {
        return {
          id: item.id,
          name: item.name,
          children: item.children && item.children.slice(0, 2),
          goods: item.goods
        }
      })
      list.push(brand)
      return list
    })

    // 弹出层显示当前分类列表
    const categoryId = ref(0)
    // 找到鼠标悬浮获得id得到某一分类的信息
    const currCategory = computed(() => {
      return menuList.value.find(item => item.id === categoryId.value)
    })

    // 获取品牌列表的数据
    findBrand().then(data => { brand.brands = data.result })
    return { menuList, categoryId, currCategory }
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;

  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;

      &:hover,
      &.active {
        background: @xtxColor;
      }

      a {
        margin-right: 4px;
        color: #fff;

        &:first-child {
          font-size: 16px;
        }
      }
    }
  }

  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;

    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;

      small {
        font-size: 16px;
        color: #666;
      }
    }

    ul {
      display: flex;
      flex-wrap: wrap;

      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;

        &:nth-child(3n) {
          margin-right: 0;
        }

        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;

          &:hover {
            background: #e3f9f4;
          }

          img {
            width: 95px;
            height: 95px;
          }

          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;

            .name {
              font-size: 16px;
              color: #666;
            }

            .desc {
              color: #999;
            }

            .price {
              font-size: 22px;
              color: @priceColor;

              i {
                font-size: 16px;
              }
            }
          }
        }
      }

      li.brand {
        height: 180px;

        a {
          align-items: flex-start;

          img {
            width: 120px;
            height: 160px;
          }

          .info {
            p {
              margin-top: 8px;
            }

            .place {
              color: #999;
            }
          }
        }
      }
    }
  }

  &:hover {
    .layer {
      display: block;
    }
  }
}

.xtx-skeleton {
  animation: fade 1s linear infinite alternate;
}

@keyframes fade {
  from {
    opacity: 0.2;
  }

  to {
    opacity: 1;
  }
}</style>
